Bulb-form lamp and its manufacturing method

Abstract

To provide a bulb-form lamp including a few compartments, which can be easily fitted in a socket of a lighting equipment and reliably carry out electrical contact between a shell and the socket of the lighting equipment. The bulb-form lamp includes a shell surrounding one end of a casing, and the shell is molded integrally with one end of the casing to make contact with an outer surface of the casing leaving substantially no gap.

What is claimed is:  
     
       1. A lamp comprising: 
       a casing having two ends and extending from a glass globe at one end to an eyelet at the other end;  
       a shell surrounding a part of the casing having a portion for mounting an eyelet at one end thereof and a portion for mounting a holder at the other end thereof, wherein  
       said shell is molded integrally with one end of said casing and is in contact with an outer surface of said casing leaving substantially no gap.  
     
     
       2. The lamp according to  claim 1 , wherein said shell further comprises screw threads at a side surface thereof. 
     
     
       3. The lamp according to  claim 1 , wherein at least one end of said shell is embedded in said casing. 
     
     
       4. The lamp according to  claim 3 , wherein a tip of an end of said shell is bent inwardly or outwardly from said shell. 
     
     
       5. The lamp according to  claim 3 , wherein a cut-out portion is located at a tip of an end of said shell embedded in said casing. 
     
     
       6. The lamp according to  claim 1 , wherein said shell further comprises a through hole filled with part of said casing. 
     
     
       7. The lamp according to  claim 1 , wherein said shell further comprises at least one end thereof with a recess filled with part of said casing. 
     
     
       8. The lamp according to  claim 1 , wherein said shell further comprises an eyelet molded integrally with a tip of said casing for contact with an outer surface of said casing, and no gap between said tip and said casing. 
     
     
       9. The lamp according to  claim 1 , wherein both ends of the shell are embedded in said casing.